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We identify isolated galaxy triplets in a volume-limited sample from theSloan Digital Sky Survey Data Release 10. Our final sample has 80 galaxysystems in the redshift range 0.04$\le$z$\le$0.1, brighter than $M_r = -20.5 +5\log h_{70}$. Spectral synthesis results and WHAN and BPT diagnostic diagramswere employed to classify the galaxies in these systems as star-forming, activenuclei, or passive/retired.  Our results suggest that the brightest galaxies drive the triplet evolution,as evidenced by the strong correlations between properties as mass assembly andmean stellar population age with triplet properties. Galaxies with intermediateluminosity or the faintest one within the triplet seem to play a secondaryrole. Moreover, the relation between age and stellar mass of galaxies issimilar for these galaxies but different for the brightest galaxy in thesystem. Most of the triplet galaxies are passive or retired, according to theWHAN classification. Low mass triplets present different fractions of WHANclasses when compared to higher mass triplets. A census of WHAN classcombinations shows the dominance of star-forming galaxies in low mass tripletswhile retired and passive galaxies prevail in high-mass systems. We argue thatthese results suggest that the local environment, through galaxy interactionsdriven by the brightest galaxy, is playing a major role in triplet evolution.

Dissecting galaxy triplets in the Sloan Digital Sky Survey Data Release 10: I. Stellar populations and emission line analysis